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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file spriteloader.hpp Base for loading sprites. */
#ifndef SPRITELOADER_HPP
#define SPRITELOADER_HPP
#include "../core/alloc_type.hpp"
#include "../core/enum_type.hpp"
#include "../gfx_type.h"
struct Sprite;
typedef void *AllocatorProc(size_t size);
/** The different colour components a sprite can have. */
enum SpriteColourComponent {
SCC_RGB = 1 << 0, ///< Sprite has RGB.
SCC_ALPHA = 1 << 1, ///< Sprite has alpha.
SCC_PAL = 1 << 2, ///< Sprite has palette data.
SCC_MASK = SCC_RGB | SCC_ALPHA | SCC_PAL, ///< Mask of valid colour bits.
};
DECLARE_ENUM_AS_BIT_SET(SpriteColourComponent)
/** Interface for the loader of our sprites. */
class SpriteLoader {
public:
/** Definition of a common pixel in OpenTTD's realm. */
struct CommonPixel {
uint8 r; ///< Red-channel
uint8 g; ///< Green-channel
uint8 b; ///< Blue-channel
uint8 a; ///< Alpha-channel
uint8 m; ///< Remap-channel
};
/**
* Structure for passing information from the sprite loader to the blitter.
* You can only use this struct once at a time when using AllocateData to
* allocate the memory as that will always return the same memory address.
* This to prevent thousands of malloc + frees just to load a sprite.
*/
struct Sprite {
uint16 height; ///< Height of the sprite
uint16 width; ///< Width of the sprite
int16 x_offs; ///< The x-offset of where the sprite will be drawn
int16 y_offs; ///< The y-offset of where the sprite will be drawn
SpriteType type; ///< The sprite type
SpriteColourComponent colours; ///< The colour components of the sprite with useful information.
SpriteLoader::CommonPixel *data; ///< The sprite itself
/**
* Allocate the sprite data of this sprite.
* @param zoom Zoom level to allocate the data for.
* @param size the minimum size of the data field.
*/
void AllocateData(ZoomLevel zoom, size_t size) { this->data = Sprite::buffer[zoom].ZeroAllocate(size); }
private:
/** Allocated memory to pass sprite data around */
static ReusableBuffer<SpriteLoader::CommonPixel> buffer[ZOOM_LVL_COUNT];
};
/**
* Load a sprite from the disk and return a sprite struct which is the same for all loaders.
* @param[out] sprite The sprites to fill with data.
* @param file_slot The file "descriptor" of the file we read from.
* @param file_pos The position within the file the image begins.
* @param sprite_type The type of sprite we're trying to load.
* @param load_32bpp True if 32bpp sprites should be loaded, false for a 8bpp sprite.
* @return Bit mask of the zoom levels successfully loaded or 0 if no sprite could be loaded.
*/
virtual uint8 LoadSprite(SpriteLoader::Sprite *sprite, uint8 file_slot, size_t file_pos, SpriteType sprite_type, bool load_32bpp) = 0;
virtual ~SpriteLoader() { }
};
/** Interface for something that can encode a sprite. */
class SpriteEncoder {
public:
virtual ~SpriteEncoder() { }
/**
* Can the sprite encoder make use of RGBA sprites?
*/
virtual bool Is32BppSupported() = 0;
/**
* Convert a sprite from the loader to our own format.
*/
virtual Sprite *Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator) = 0;
/**
* Get the value which the height and width on a sprite have to be aligned by.
* @return The needed alignment or 0 if any alignment is accepted.
*/
virtual uint GetSpriteAlignment()
{
return 0;
}
};
#endif /* SPRITELOADER_HPP */
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